Abstract
A developed mathematical model of a gas turbine power plant with an additional air bottoming cycle to utilize heat of exhaust gases was used to carry out a technical and economic analysis. The approach used in the study is aimed at solving two types of optimization problems: (1) to determine the maximum net efficiency of the power plant and (2) to adjust the equipment and operating parameters for achieving minimum costs of electricity production. The study shows that the air bottoming cycle provides an increase in the net efficiency up to 44 - 48% and adds about 20% to the installed power capacity. The minimum costs of electric energy production estimated for different prices of fuel (natural gas) are competitive enough, so the gas turbine power plant with air bottoming cycle seems to be a promising technology for medium-power generation.
Highlights
The electricity generation from fossil fuels, especially natural gas, using gas turbines has been a rapidly developing technology in the last decades
Modern gas turbine units of the medium power range from 25 to 100 MW are characterized by high electrical efficiency
The authors of [7] compare the marginal cost of electric energy generated by various commercially available gas turbines such as Taurus 60, Titan 130 and UGT 25000, which are integrated into two bottoming utilization cycles based on air or steam
Summary
The electricity generation from fossil fuels, especially natural gas, using gas turbines has been a rapidly developing technology in the last decades. There are many technologies for using heat of exhaust gases: regenerative heating of compressed air; regenerative water heating for steam injection into a turbine or compressor; the use of an additional steam cycle for the production of thermal or electric energy in combinedcycle power plants [3]. One more technology for the use of waste heat from the gas turbine exhaust gases is the additional air bottoming cycle (GT-ABC). The authors of [7] compare the marginal cost of electric energy generated by various commercially available gas turbines such as Taurus 60, Titan 130 and UGT 25000, which are integrated into two bottoming utilization cycles based on air or steam (combined cycle). This paper presents additional research to evaluate technical-economic parameters of GT+ABC for a class of medium power plants of 25-60 MW
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